linux-kernel - HiKey boot hangs with Linus' HEAD due to coresight dts changes?

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Date:   Thu, 16 Nov 2017 17:54:14 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Li Pengcheng <lipengcheng8@...wei.com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Li Zhong <lizhong11@...ilicon.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Guodong Xu <guodong.xu@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: HiKey boot hangs with Linus' HEAD due to coresight dts changes?

Testing with Linus' HEAD today on the HiKey board, I started seeing boot hangs:
...

[    0.677971] Serial: AMBA PL011 UART driver
[    0.694299] pstore: using zlib compression
[    0.698830] console [pstore-1] enabled
[    0.702623] pstore: Registered ramoops as persistent store backend
[    0.708880] ramoops: attached 0x100000@...1f00000, ecc: 0/0
[    0.715847] f8015000.uart: ttyAMA0 at MMIO 0xf8015000 (irq = 7,
base_baud = 0) is a PL011 rev2
[    0.725011] uart-pl011 f7111000.uart: could not find pctldev for
node /soc/pinmux@...10000/uart1_pmx_func, deferring probe
[    0.736375] uart-pl011 f7112000.uart: could not find pctldev for
node /soc/pinmux@...10000/uart2_pmx_func, deferring probe
<hangs here>

Bisecting this down, points to:
  0b79842775fa ("arm64: dts: hi6220: add coresight dt nodes")

Reverting this patch makes things work again.

Any ideas as to what might be wrong?

Please let me know if I can test any fixes or provide any additional info.

thanks
-john